Sanborn Map Company. Sanborn fire insurance maps.

GUIDE: Library of Congress. Geography and Map Division. Reference and Bibliography Section. Fire insurance maps in the Library of Congress : plans of North American cities and towns produced by the Sanborn Map Company; a checklist. Fiche The Center holds the complete microfilm set for all 50 states and the District of Columbia which includes approximately 10,000 cities and towns. The maps cover the period from the 1880s to the 1950s.